CN102763428B - The multipath transmission of self adaptation flow transmission - Google Patents

The multipath transmission of self adaptation flow transmission Download PDF

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Publication number
CN102763428B
CN102763428B CN201180010224.5A CN201180010224A CN102763428B CN 102763428 B CN102763428 B CN 102763428B CN 201180010224 A CN201180010224 A CN 201180010224A CN 102763428 B CN102763428 B CN 102763428B
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bit rate
path
available
client device
measured
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CN102763428A (en
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G.比科特
S.戈雅克
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Thomson Licensing SAS
International Digital Madison Patent Holding SAS
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Thomson Licensing SAS
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/631—Multimode Transmission, e.g. transmitting basic layers and enhancement layers of the content over different transmission paths or transmitting with different error corrections, different keys or with different transmission protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/612—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for unicast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/613—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for the control of the source by the destination
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/65—Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/70—Media network packetisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/75—Media network packet handling
    • H04L65/752—Media network packet handling adapting media to network capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/80—Responding to QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/14—Multichannel or multilink protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
    • H04N21/44209—Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
    • H04N21/4621—Controlling the complexity of the content stream or additional data, e.g. lowering the resolution or bit-rate of the video stream for a mobile client with a small screen
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
    • H04N21/4622—Retrieving content or additional data from different sources, e.g. from a broadcast channel and the Internet

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Databases & Information Systems (AREA)
  • Computer Security & Cryptography (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Information Transfer Between Computers (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Computer And Data Communications (AREA)

Abstract

The present invention generally relates to self adaptation flow transmission, relates in particular to for the method via self adaptation flow transmission technology transferring content on multiple communication paths and realizes the equipment of the method. thus, the present invention pays close attention to a kind of for the method for the content that will present on client device CD is provided, this client device comprises at least the first and second communication interface CI1, CI2, wherein, described the first and second communication interface CI1, CI2 has mailing address, described content is via at least the first and second server interface SI1 with mailing address, SI2 is addressable for client device CD, the first path P1 is by the address of described first interface CI1 and the address designation of first server interface SI1, the second path P 2 is by the address of described the second interface CI2 and the address designation of second server interface SI2, described content has and the bit rate BRA supporting, BRB retrains under at least two versions of corresponding coding quality available, described at least two versions each is divided into identical piece corresponding to duration that present with described content in time, by the bit rate BRA of time index i and support, one of BRB carrys out home block. according to the present invention, the method comprises the following steps :-S1 measures the second Available Bit Rate BR2 in the first Available Bit Rate BR1 and the second path P 2 on the first path P1, S2 according to measured the first Available Bit Rate BR1 and according to the second measured Available Bit Rate BR2 at the bit rate BRA supporting, in BRB, determine the bit rate RBR that asks, S3 sends for receiving by time index i with by the first request of the Part I of the piece of asked bit rate RBR mark and via the second path P 2 and sends the second request of Part II for receiving described via the first path P1, and described first and second parts of piece are complementary, S4 receives the Part I of asking and receives asked Part II via the second path P 2 via the first path P1.

Description

The multipath transmission of self adaptation flow transmission
Technical field
The present invention relates generally to self adaptation flow transmission, relate in particular to for existing via self adaptation flow transmission technologyThe method of transferring content and realize the equipment of the method on multiple communication paths.
Background technology
This part intention introduces the technology of each side to reader, it may relate to following description and/or requirementVarious aspects of the present invention. Believe that this discussion will contribute to provide background information to reader, so that betterVarious aspects of the present invention are understood on ground. Therefore, should be appreciated that Given this read purposefully of these narrations, andShould not be construed as admission of prior art.
It is the main agreement based on such as following: IETFRFC2326 that media transmit flow transmission solutionThe real time streaming transport protocol (RTSP) of middle definition, from the Microsoft media server of Microsoft(MMS) specific protocols or exclusive from the real-time transmission messaging protocol (RTMP) of Adobe systemAgreement.
Recently, there is different spies in described self adaptation and the flow transmission technology based on http protocolPoint (flavor), such as " moveable self-adaption stream " from mobile network, from " the HTTP of Apple companyLive stream transmission " and from " the level and smooth flow transmission of IIS (internet information service) " of Microsoft. At thisIn a little flow transmission solutions, using the benefit of http protocol is that it seamlessly crosses over NAT and fire wallAbility. HTTP self adaptation flow transmission technology is by upgrading continuously and moderately or degradation video matterMeasure, provide a kind of mode unstable (erratic) network behavior being compensated about available bandwidthTo be applicable to bandwidth constraint.
In more detail, describe from the WO2005/109224A2 of MoveNetworks (mobile network)A kind of host client-side and can the agent controller module of the adaptive fluctuation network bandwidth inMechanism, this is because following true, with multiple subflows (streamlet), is also referred to as piece, by matchmaker beforeSoma is stream, and each subflow is encoded from low bit rate to high bit rate. According to the available network bandwidth andSome other additional informations, the monitoring tool http protocol that is incorporated to agent controller module is asked clothesBusiness device send will be in TCP/IP connection optimal of flow transmission. On the basis of basic block, according toAgent controller module increases or reduces quality.
From mobile network's WO2009/020552A1, following a kind of system is disclosed: client is used shouldMultiple connections between client and individual server are once to a more than subflow or its part or sonStream carries out the method for " parallel fetching ".
IISSmoothStreamingTechnicalOverview, from AlexZambelli, MicrosoftIn March, 2009 has been described the level and smooth flow transmission skill of the IIS based on http protocol in TCP/IP connection by companyArt. Before the media that will be transmitted by server flows, be split into typical example as the piece of one to ten second duration.Then these pieces according to standard H.264/MPEG-4AVC with different bit rates coding and be stored in MP4In file format container. By application code, Silverlight application program, real in client-side entiretyNow select bit rate according to network bandwidth fluctuation and seamlessly to the mechanism of server request corresponding blocks.HTTP live stream transmission response is supported dynamically cutting between the stream of different data rate in changing connection speedChange.
Apple company has submitted Internet-Draft in October, 2009 to IETF, and name is called " HTTPLiveStreamingdraft-pantos-http-live-streaming-02 " HTTP flow transmission method specification. HTTPFlow transmission framework is based on three pillars: server, by Web server or web cache systemDistribution, and client. The media of wanting flow transmission are the videos of H.364 encoding and encode with AACAudio frequency. On server, the particular tool that its utilization is called Apple stream sectionaliser is encapsulated inIn MPEG-TS container and be segmented into and equate the piece of duration. This instrument generation saves as * .ts fileThe index file * of piece and formation piece playlist; M3u8. Then first client obtains by URL pointerIndex file. Index file specifies again media files available, decryption key and any available alternative streamPosition. For the stream of selecting, client is downloaded each available media file in order.
HTTP self adaptation flow transmission method is generally positioned as the adaptive of end user according to network congestionAnswer media viewing experience. In fact,, as long as the network bandwidth that client device is measured declines, client is establishedThe piece that standby just request is not too harsh with respect to network bandwidth requirement; " low bandwidth piece ". On the contrary, ask when congestedWhen topic reduces, the piece that client device request is harsher with respect to network bandwidth requirement; " high bandwidth piece ".
Fig. 1 a illustrates according to the key step of the self adaptation flow transmission method of prior art. Fig. 1 a illustrates utilizationImply progressive mass penalty increase support bit rate (in advance) be encoded to four versions (version A,Version B, version C and version d) video content. Coding video content be divided into permission seamlessly fromOne bit rate is switched to another piece. The corresponding identical fixing duration of all video blocks. ThisA little pieces are either large or small: thus, depend on the bit rate of support, have relatively high expectations/lower bandwidth and providingGood/poor video quality. Be stored in all versions (version A, version B, version C in server CS1And version d) be divided into the piece of fixed qty, 14 pieces in Fig. 1 a.
In Fig. 1 a, illustrate according to the first step of the method for prior art: client device CD monitors willClient device CD is connected to the bit rate BR1 of the path P 1 of server CS1.
In second step, client device CD determines the ratio of the request that meets measured bit rate BR1Special rate RBR. For example, the bit rate RBR asking be supported bit rate BRA, BRB, BRC,Maximum in BRD, it is also less than or equal to measured bit rate BR1.
In third step, client device is asked by time index i (at this, 1 < i < 14) via path P 1Piece with asked bit rate RBR mark.
In the 4th step, client device CD still receives from path P 1 with the bit rate RBR being askedFrom the described i of server CS1.
While needing piece, repeat four steps at every turn.
Fig. 1 b illustrates the bit rate time evolution of the method for the prior art self adaptation flow transmission presenting above.
Curve on Fig. 1 b illustrates monitored bit rate BR1. Below curve, a representative is from serviceThe piece that device is downloaded. Typical adaptive customer end will be monitored Available Bit Rate (or bandwidth) also continuouslyAnd by the piece subsequently that will fetch selects to be less than or equal to the bit rate of being asked of Available Bit Rate BR1.Certainly, depending on implementation and environment (network technology, application), this strategy may guard-,Client is only asked the piece of higher bit rate after the certain hour of guaranteeing smooth upgrade conversion; VisitorAs long as family end detect hint rapidly degradation conversion Bandwidth Reduction just request compared with the piece of low bit rate-orMore positive. In Fig. 1 b, there are 4 different bit rates of four versions of the corresponding encoded content of describing.
Utilize the self adaptation flow transmission solution of explaining above, the video flowing that client CD block-by-block obtains is notThere is consistent in time quality. Be appreciated that in the time that bandwidth declines, user experiences may be destroyed. Depending onFrequently never or less interruption, but quality may be very poor. Except reducing the quality of the content shifting, noExist in order to get rid of other specific solutions of this situation. Increase receiver buffer and will avoid itMiddle transmission occupies the more time than expection but cuts little ice for temporary transient low bandwidth availabilityExpected Results (dryeffect).
A target of the present invention is that (the two is by visitor by using at least two (independently) bang pathsFamily end control) reply bandwidth temporary transient deficiency (or bit rate slows down fast). These bang pathsMust present mutual as far as possible incoherent transmission characteristic. This can realize in the following manner: make oneClient (for example, terminal) for example, via at least two different access networks (, broadband xDSL and honeybeeNest 3G/LTE) be connected to server and/or be connected to the server being connected with at least two similar access networks(may be managed by two different ISPs) or this can be realized in the following manner:Make a client be connected at least two servers, each server is connected to different access networks.The latter may be easier to realize and will pay close attention to this implementation for the present invention. At the remainder of documentIn, server can be regarded as being connected to the physical box in dedicated link/path or also be regarded as by specialPath/link-attached logic entity.
Be appreciated that the present invention applies at least two link/path. At a machine of host's logical serverSituation in, this machine must support many hosts (multihoming) (, can be connected to more than oneIndividual network interface, eachly has special (for example IP) network address).
Substitute block file is stored on a server, they can be stored in by two different(each server has himself network insertion and himself to addressable two servers of communication pathIP address) on.
In the time that client detects that bit rate available on one of path is declining, it can be from replacingDownload next piece for server, or the next part of piece. This can pass through failover (failover)Algorithm (use a main path and use alternative path in the time that this main path is harder), pass throughLoad balancing algorithm (two paths of parallel use a: part for piece is transmitted and from one of serverDivide from other servers and transmit) or even (meet in needs added bit rate by limit bandwidth algorithmUnder the situation of overall situation bit rate target, ensure minimum overall situation ratio by main path P1 and additional path P2, P3Special rate) realize.
Summary of the invention
The technical problem that the invention is intended to solve is to improve self adaptation flow transmission method, makes it for communicating by letterThe problem that temporary transient low bandwidth availability on path causes is not too responsive.
Thus, according to first aspect, the present invention pays close attention to one and is used for providing and will on client device CD, presentsThe method of content, this client device at least comprises the first and second communication interface CI1, CI2, wherein,Described the first and second communication interface CI1, CI2 has mailing address, and described content is via at least having communicationThe first and second server communications SI1 of address, SI2 is addressable for client device CD, theOne path P 1 is by the mailing address of described the first communication interface CI1 and the ground of first server communication interface SI1Location mark, the second path P 2 is communicated by letter and is connect with second server by the mailing address of described second communication interface CI2The address designation of mouth SI2, described content is at the bit rate BRA that has and support, and BRB retrains corresponding volumeAvailable under at least two versions of code quality, the each of described at least two versions is divided into and institute in timeState the identical piece corresponding to duration that present of content, by the bit rate BRA of time index i and support, BRBOne of carry out home block, described client device CD is by the first and second path P 1, P2 is addressable institute simultaneouslyState content.
According to the present invention, the method is included in the following steps on client device CD:
S1 measures second in the first Available Bit Rate BR1 on the first path P1 and the second path P 2 canUse bit rate BR2;
S2 is according to the first measured Available Bit Rate BR1 and according to the second measured Available Bit RateBR2, at the bit rate BRA supporting, determines the bit rate RBR that asks in BRB;
S3 identifies for time of reception index i and the bit rate RBR asking via the first path P1 transmissionThe first request of the Part I of piece and send second for receiving described via the second path P 2The second request dividing, described first and second parts of piece are complementary;
S4 receives the Part I of asking and asks via the second path P 2 receptions via the first path P1The Part II of asking.
Thus, according to second aspect, the present invention pays close attention to a kind of for receiving the client of the content that will presentEquipment CD, described client device at least comprises the first and second communication interface CI1, CI2, wherein,Described the first and second communication interface CI1, CI2 has mailing address, client device CD at least viaThere are the first and second server communications SI1 of mailing address, the addressable described content of SI2, firstPath P 1 is by the mailing address of described the first communication interface CI1 and the ground of first server communication interface SI1Location mark, the second path P 2 is communicated by letter with second server by the mailing address of described second communication interface CI2The address designation of interface SI2, described content has and the bit rate BRA supporting, and BRB retrains correspondingAt least two versions of coding quality under available, described at least two versions each in time by pointFor with piece corresponding to the identical duration of described content, piece is by the bit rate of time index i and supportBRA, BRB mark, described client device CD is by the first and second path P 1, and P2 simultaneously canAccess described content.
Client device CD according to the present invention comprises:
For measuring the in the first Available Bit Rate BR1 on the first path P1 and the second path P 2The parts of two Available Bit Rate BR2;
For the first Available Bit Rate BR1 according to measured and the second measured Available Bit RateBR2, at the bit rate BRA supporting, in BRB, determine the parts of the bit rate RBR that asks;
For sending for time of reception index i and the bit rate RBR asking via the first path P1First of the Part I of the piece of mark is asked and is sent and be used for receiving described via the second path P 2Part II second request parts, described first and second parts of piece are complementary;
For receiving the Part I of asking and receive via the second path P 2 via the first path P1The parts of the Part II of asking.
The present invention proposes based on using a more than server to strengthen with switching mode or with parallel modeThe self adaptation flow transmission method of prior art, its permission:
Better total quality;
According to the robustness of the improved service of angle of client;
According to SVC encoding block in the situation that, according to the improved service scalability of angle of server.
Another advantage of the present invention is, the framework compatibility of itself and known flow transmission equipment. According to thisThe method of invention can realize between according to the server and client side of prior art, and does not want receivingThe player of the stream of playback changes.
Brief description of the drawings
With reference to accompanying drawing, utilize following nonrestrictive embodiment and carry out example, will understand better and exampleShow the present invention, wherein:
Fig. 1 a illustrates that client device CD described above uses the self adaptation stream according to prior artThe method of transmission is to server request content;
Fig. 1 b illustrate described above according to prior art about the bit rate of assessment, with self adaptation streamThe time evolution (evolution) of the bit rate that transmission method is corresponding;
Fig. 2 illustrates according to the implementation of the multipath self adaptation flow transmission method of embodiment;
Fig. 3 a is according to the block diagram of the client device of embodiment;
Fig. 3 b illustrate use thus parallel method, according to the self adaptation flow transmission method of embodiment institute surveyThe time evolution of the Available Bit Rate of amount;
Fig. 4 a illustrates according to the time evolution of the bit rate of the self adaptation flow transmission method of embodiment;
Fig. 4 b illustrate use thus failover method, according to the ratio of the self adaptation flow transmission method of embodimentSpecial rate time evolution.
In Fig. 3 b, the piece of representative is pure functional entity, and it is not necessarily corresponding to physical separation entity.That is, they can be developed with the form of hardware or software, or with one or some integrated circuits realityExisting.
Detailed description of the invention
Be appreciated that drawing and description of the present invention are simplified, with illustrate be used for being expressly understood of the present inventionRelevant factor, for purposes of clarity simultaneously, has removed typical digital multimedia content transmission method and has beenMany other key elements that occur in system. But because these key elements are well-known in the art, at thisDiscussing in detail these key elements is not provided. Content disclosed herein is known for those of ordinary skill in the artAll these variants and modifications.
In this part, describe and utilize Fig. 2 to illustrate according to embodiment to client device CD transferring contentMultipath self adaptation flow transmission method.
In Fig. 2, represent according to the client device of embodiment. Client device CD by the first path P1,The second path P 2 accesses content. The mailing address of the first communication interface CI1 of client device CD and the first clothesThe mailing address of business device communication interface SI1 defines the first path P1. Correspondingly, second of client device CDThe mailing address of the mailing address of communication interface CI2 and second server communication interface SI1 defines the second pathP2。
Advantageously, individual server CS1 comprises the first and second communication interface CI1, CI2.
Advantageously, the first and second communication interface CI1, CI2 be included in two different server CS1,In CS2. To in Fig. 2, illustrate this situation.
Advantageously, server CS1, CS2 are http servers.
Client is also connected to player 4 (not shown)s. At server side, use http protocol at TCP/IPIn connection according to client-requested flow transmission piece. Client is according to below describing and surveying based on path bit rateThe part of the algorithm request block of amount. Piece is completely received by client before should and presenting in its decoding. VisitorFamily end equipment CD can be by the first and second communication interface CI1, CI2 request content simultaneously.
Being appreciated that can be by described path P 1, P2 downloading contents. Different services will be depicted in below,On device CS1, CS2, copy the situation of described content: in other words, two server communications SI1, SI2Be positioned on two different server CS1, CS2. If server communications SI1, SI2 are positioned at storageThe individual server CS1 holding is upper, and situation is similar: difference is only not at two different serversUpper reproducting content. This is by providing data redundancy to be conducive to security.
Content is for example video or the audio content being downloaded to present at client-side. For example, once underCarry, client device CD just transmits described content at player (not representing in Fig. 2) block by block, to useIn playback.
Such as generating content of content preparation tool. This instrument is with at least two targets (or support) ratioSpecial rate (for example, BRA=300kbps, BRB=600kbps, BRC=1000kbps, BRD=2000Kbps) generate compressed video and audio content (being respectively for example H264 and MP3). Content preparation toolThey are multiplexed, produce MPEGTS (MPTS) block series with the bit rate by supporting.
The all identical duration corresponding to content, for example each target bit rate 2 seconds. For example pass throughTime index i (1 < i < 14 in this example) and bit rate BRA, BRB, BRC by supporting,One of BRD home block.
On accompanying drawing below all, piece is expressed as rectangle frame: the horizontal size of described frame is identical and rightShould the above-described identical duration. The quality of described of the vertical size diagram of described rectangle frame andBit rate BRA, BRB, one of BRC, BRD of corresponding described support. Then, belong to block seriesAll there is identical vertical size. It is identical that but piece not of uniform size that belongs to block series has surelySize. The serial block size being identified by different time index depends on the time evolution of content.
Block series be stored in two server CS1, CS2 in Fig. 2, representing upper and by " version A "," version B ", " version C " and " version d " mark. In the expression of choosing, be stored in two clothesAll on business device CS1, CS2 is identical except time index i.
Two server CS1, CS2 are connected to client device CD on two different access networks,Form two independent pathways (P1, P2).
In the time that connection is set up, client device CD at least one reception from server CS1, CS2Inventory file (manifestfile). This inventory file comprise support bit rate BRA, BRB, BRC,The list of BRD and for bit rate BRA, BRB, BRC, the BRD of each support, these rowTable also comprises sum and the block size of piece.
Advantageously, the list of alternative server proposed in described inventory file (or alternativeServer communications address).
Fig. 3 a illustrates provides four of the method for content main step to client device CD according to embodimentSuddenly.
In first step S1, the Available Bit Rate on client device CD monitoring path P 1, P2:In path P 1, measure continuously Available Bit Rate BR1 and measure Available Bit Rate in path P 2BR2。
Advantageously, lower than or period of equaling the piece duration periodically measure bit rate BR1,BR2: in the example of describing, this period is 2 seconds.
Advantageously, the step S1 of measurement the first and second Available Bit Rate BR1, BR2 is to calculate visitorFamily end equipment CD sends request and server CS1, CS2 by described the first and second path P 1, P2Send the two-way time of confirmation message by described the first and second path P 1, P2 in response to described request.
At second step S2, client device CD is according to the survey of the first and second bit rate BR1, BR2Amount is determined the bit rate RBR asking in the bit rate BRA, the BRB that support, BRC, BRD.In the bit rate BRA, the BRB that support, BRC, BRD, exclusiveness is chosen institute (exclusively)The bit rate RBR of request, as defined in inventory file. The bit rate RBR definition of asking is askedThe bit rate of the piece of asking.
Advantageously, comprise other step: client device CD one of at least connects via path P 1, P2The bit rate BRA that revenue and expenditure is held, the list of BRB, and other step: for the bit of each supportRate BRA, BRB receive the size of piece.
Advantageously, client device also comprises for one of at least connecing via the first and second path P 1, P2Receive with the relevant information of bit rate BRA, BRB of support and for the bit rate BRA of each support,BRB receives the parts of the information relevant with block size.
Advantageously, determine that the step S2 of the bit rate RBR asking is, at the bit rate BRA supporting,BRB, BRC, selects Maximum Bit Rate in BRD, its lower than or equal the first measured available bitsThe summation SUM of rate BR1 and measured the second Available Bit Rate BR2 deducts setting (provsion).
Advantageously, the parts of determining the bit rate RBR that asks adapt to measured first available of assessmentThe summation SUM of bit rate BR1 and measured the second Available Bit Rate BR2, and described parts are suitableBe assigned in support bit rate BRA, BRB in select Maximum Bit Rate, its lower than or equal measuredThe first Available Bit Rate BR1 and the summation SUM of measured the second bit rate BR2 deduct setting.
In third step S3, client device CD via path P 1 and P2 separately to two serversCS1 and CS2 send the request with the piece of the bit rate RBR mark of asking by time index i. MoreParticularly, client device CD sends out to server CS1 with asked bit rate RBR via path P 1Send the request of the Part I to piece, and send for piece to second server CS2 via path P 2The request of Part II, described first and second parts of piece are complementary.
By use term " complementation ", wish be described between Part I and Part II, do not exist overlappingAnd first and second part the two set produce whole.
The 4th step S4 is, client device CD receives institute via the first path P1 concurrently and asksPart I and receive asked Part II via the second path P 2. Path P 1, P2 are used forConcurrently for piece is provided.
By using term " concurrently ", wish to emphasize parallel route P1, P2 the two simultaneously for completelyDownload single: be not by the part of path P 1, the two download piece of P2.
In Fig. 3 b, diagram is according to the client device CD of embodiment. Client device CD is included inThe first interface CI1 of one network and to the second interface CI2 of second network, first network comprise forThe protocol stack that the first server communication interface of the server CS1 connecting by first network communicates,Second network comprises with the second server communication interface of the server CS2 being connected by second network and carrying outThe protocol stack of communication. Particularly, the first and second networks are internets. Certainly, it can be to make visitorFamily end can with the network of any other type of server communication.
Client device CD also comprises the 3rd interface 16 that is connected to player, and this player adapts to solutionCode and rendering content. Certainly, the 3rd interface can make it possible to connect a more than player. It canThe interface to network, to make it possible to be connected to one or more player. Client device CDAlso comprise for the treatment of the processor 11 that is stored in the application in client. It also comprises memory unit 12,Such as memory, before being sent to player for a part for the piece receiving from server or pieceThey are cushioned. Particularly, memory is nonvolatile memory. Certainly, client comprises notThe nonvolatile memory of application program that illustrate, for storage running in client. Client canTo realize in gateway device; Client device can be implemented as software or hardware.
The Part I of asking has big or small NB1, and the Part II of asking comprises having the second sizeNB2。
Advantageously, the ratio of described the first big or small NB1 and described the second size (NB2) equals measuredThe ratio of the first Available Bit Rate BR1 and measured the second Available Bit Rate BR2.
Advantageously, the step S2 that determines the bit rate RBR that asks comprise assessment measured first canBy the step of the summation SUM of bit rate and measured the second Available Bit Rate BR2, and institute asksBit rate RBR according to this summation SUM determine.
Advantageously, the piece that the first big or small NB1 and time index i and the bit rate RBR that ask of institute identify greatlyThe ratio of little and measured the first Available Bit Rate BR1 and summation SUM is proportional.
Certainly, be available according to the various implementations of the method for embodiment, relate to client device CDVia parallel route P1, P2 ... the part of Pn request block. Client device CD is opened to n serviceDevice CS1, CS2 ..., CSn connection, wherein, content the BR1 of the support different from two,Available under at least two versions of BRB difference correspondence. Client device CD is parallel to be sent for simultaneouslyFrom these servers CS1, CS2 ..., the request of the non-overlapped part of the content blocks of CSn.
The expectation advantage of this method is to cross over available server CS1, CS2 ..., CSn distribution communication amount is negativeCarry. Recalculate redistributing of load for each. By the piece part from this server requestSize is determined from each server CS1, CS2 ..., the load of CSn request. Client device CD instructionIt is wished by comprising the byte quantity of bytes range head from each server retrieves. This head hasFollowing form:
Advantageously, the request that client device sends is HTTP request.
GET/path/example.jpgHTTP/1.1
Host:example.com
Range:bytes＝0-999
In above example, request means the resource " example.com " that client device request is specifiedStart 1000 bytes. For the given range of given, each request/response of utilization and server,Client device CD calculates current Available Bit Rate BR1, BR2, and ..BRn is as follows:
BR1i＝nbytesSC1,i8÷timeSC1,i
Wherein, nbytesCS1, i be for have the time index i piece of (being also called " iteration "), from serviceThe quantity of the byte of device CS1 request, timeCS1, i is for having the piece of time index i, from serverCS1 downloads the required duration of piece part of asking.
Can use this instantaneous Available Bit Rate to measure, with feed-in (feed) guarantee progressive quality improvement andThe smoothing algorithm of the quick response to serious network impairment. This smoothing algorithm provides can be for asking nextThe Available Bit Rate of piece is estimated.
E1,i＝f(BR1,i,BR1,i-1,…,BR1,i-k)
In this case, n server is available, for downloading total available bits of next pieceRate is:
SUM = &Sigma; s = 1 , . . . , n E s , i
Advantageously, its relate in Fig. 3 a, do not represent, measure on path P 1, P2 for determiningWhether the first and second Available Bit Rate BR1, BR2 are greater than another step SA of threshold value BRTH1, itsIn, carry out exclusively four step S1, S2, S3, S4, client device CD for path P 1, P2On path P 1, P2, determine that measured Available Bit Rate BR1, BR2 is greater than threshold value BRTH1.
In another embodiment, just in order to reach the target bits that is greater than or equal to threshold value BRTH2Rate, the parallel schema of executable operations. Use situation for this operator scheme will allow to guarantee given ratioSpecial rate BRTH2, instead of transfer all available paths with any cost. In other words, only at needsReach in the situation of asked bit rate BRTH2, just use second server CS2.
Only from individual server CS1, content block-by-block is downloaded to client device CD via path P 1.By the first Available Bit Rate BR1 on client device CD measuring route P1. When client CD determinesWhen Available Bit Rate BR1 is less than threshold value BRTH2, carry out exclusively four step S1, S2, S3, S4,And under that situation, determine that the step S2 of the bit rate RBR asking is, the ratio of supportingIn special rate BRA, BRB, select to be less than or equal to threshold value BRTH2 and deduct the Maximum Bit Rate of setting.
The bit rate RBR asking of next piece of downloading is less than or equal to total available bitsThe Maximum Bit Rate of supporting (bit rate BRA, the BRB, BRC, the BRD that are supporting of rate BR1+BR2In, as defined in inventory file). Block size (being expressed as byte) can be approximated to be:
size＝RBR·duration÷8
In the situation that there is no minimal bit rate threshold value, the byte that next iteration is downloaded from s serverQuantity is directly proportional to s the share of measuring in total bandwidth SUM of Available Bit Rate BR1.
nbytess,i+1＝size·Es,i÷SUM
In the time that minimal bit rate threshold value BRTH1 starts to play, distribute multiplier to the contribution of each serverKs, this makes its bit rate disabled lower than the server of threshold value. When with client device CD and serviceWhen bit rate BRs corresponding to path Ls between device CSs is greater than or equal to threshold value, ks=1. WhenBit rate BRs is lower than threshold value, ks=0. Total bit rate formula becomes:
SUM = &Sigma; s = 1 . . n k s &CenterDot; E s , i
It is starkly lower than the total bit rate calculating in the situation that there is no threshold value. From s serverThe byte number quantitative change of carrying is:
nbytess,i+1＝size·ks·Es,i÷SUM
The quantity of these bytes is used to the bytes range suitable from each server request, so if depositN server, client
From server CS1 request scope [0; Nbytes1-1]
From server CS2 request scope [nbytes1; Nbytes2-1]
From server CS3 request scope [nbytes1+nbytes2; Nbytes3-1]
From server CSk (k < n) request scope [nbytesk-1]
From server CSn request scope [endoffile]
This final range uses special range to finish instruction, to tackle the fact that piece is often inhomogeneous size.Like this, this last scope permission client is fetched this piece in the case of the accurate size of not knowing pieceEnding.
In the time receiving bytes range from Servers-all, client device CD is simply with ascending order cascadeBytes range, with whole of reconstruct. Then this piece normally uses (consume) by player module,Just as it is derived from individual server.
Advantageously, download piece from server CS1, CS2 at every turn, carry out four step S1, S2, S3,S4。
Also fit in the violent reduction that overcomes bit rate on one of path according to the method for embodiment.
Advantageously, client device CD comprises for determining the available ratio on path P 1, one of P2, P3Whether special rate is less than the parts of threshold value BRTH2, BRTH3.
Whether client device CD adapts to the transmission duration of institute's requested part of for example determining piece i superCross threshold value DTH.
As a result, client device CD can determine to stop (or ignoring) and processing during iterationThe ending of the request (for example, bytes range) of carrying out, and submit to and be used for obtaining to next server immediatelyThe new request of the remainder bytes of the scope that must complete. This next server is for example to utilize higher bitThe accessible server of rate or one group of server. In this case, client sends for receiving not yetThe request of the segmentation of the part of received.
In an example, the method is described, in this example, client device CD via three independentlyPath P 1, P2, P3 accessible content, for example, these contents are at three server CS1, CS2, CS3On copy, according on first, second, and third path P 1, P2, P3, measure respectively first, secondDetermine with the 3rd Available Bit Rate BR1, BR2, BR3 the bit rate RBR that asks. Client device CDThe piece having identified via the first path (P1) request time index i and the bit rate RBR askingPart I, asks the Part II of described via the second path P 2, ask via Third Road footpath P3The Part III of described.
Relate to further step according to the method for embodiment:
In the time that described client device CD receives the first and second asked part completely, clientEquipment CD receives the first segmentation of Part III, and works as client device CD and determined in pathWhen Available Bit Rate BR3 on P3 is less than threshold value BRTH3,
S5 sends the remaining segment of the Part III of the piece identifying for time of reception index i via path P 1The first complementary portion request and send for the piece of time of reception index i mark via path P 2The request of the second complementary portion of the remaining segment of Part III, the first complementation and the second complementary portion are institutesState the complementary portion of remainder.
For the path P 2 having lower than the bit rate of threshold value BRTH3, the segmentation (example of client-requested pieceAs, current block). For example, fragment size is that threshold value BRTH3 is multiplied by the piece duration (for example, 2s)Half.
nbytes CS 3 , i + 1 = ( BRTH 3 &divide; 8 ) . duration 2
This segmentation is only for keeping the accurate bit rate assessment for this particular path. This segmentation is not passedBe delivered to player.
In a further embodiment, the duration of single by algorithm adapt to redistribute negativeCarry.
Corresponding with the embodiment of (evolving) threshold value BRTH2 of evolution measured shown in Fig. 4 aThe time evolution of bit rate BR1, BR2.
The first curve (solid line (plainline)) illustrates the measured bit rate BR1 on the first path P1Time evolution. The second curve (dotted line) illustrates the measured bit rate BR2 in the second path P 2Evolution. The 3rd curve (thick dashed line) illustrates the evolution of measured gross bit rate BR1+BR2. ?This it be constant.
This is advantage compared with prior art presented above: even if exist measured on single pathSome time fluctuations of bit rate, when consider in this total bit rate BR1+BR2 time, this fluctuationAverage out. Relatively, the bit rate BRB asking is constant, and then, client deviceThe quality of the piece receiving is constant, even if there is bit rate fluctuation on path P 1, P2.
On same figure, the piece that client device CD receives by path P 1 and path P 2 is respectively shownThe first and second parts: horizontal provision frame illustrates the Part I of piece receiving via the first path P1,Blank box illustrates the Part II of the piece receiving via path P 2. At this, the piece receiving has whole phasesThe bit rate RBR of same request, this is because be constant at the bit rate BR1+BR2 of this total.But, according to the relative fluctuation of measured bit rate BR1 and BR2, the size of Part I and secondRelation between the size of part becomes in time due to the time fluctuation of measured Available Bit RateChange.
Similar hypothesis with the time evolution of the bit rate to measured starts, and Fig. 4 b illustrates when considering thresholdThe part of the piece of downloading by the first and second path P 1, P2 when value BRTH2.
Only low by for example working as Available Bit Rate BR1 measured in path P 1 in this designSpecified conditions in the time of threshold value BRTH2 are realized Parallel download. In normal operating, realize at single clothesDownload on business device. This situation is shown on Fig. 4 &, and wherein, client device CD is only when real bentPiece is asked and received to line via single path P 1 during lower than threshold value BRTH2.
Correspondingly, need only measured bit rate BR1 lower than described threshold value BRTH2, client device existsIn other path P 1, measure the second Available Bit Rate BR2 and the part via two path request pieces.
In this description, claims and accompanying drawing, disclosed reference can independently provide or with any suitableCombination provides. These features can realize with hardware, software or both combinations in due course.
" embodiment " who quotes at this or " embodiment " refer in conjunction with the embodiments described specificFeature, structure or characteristic can be included at least one implementation of the present invention. Each at descriptionThe wording " in one embodiment " that individual position occurs differs to establish a capital and refers to identical embodiment, neitherMust mutually repel the independent or interchangeable embodiment of other embodiment.

Claims (15)

  1. One kind will be at client device for providing on the first path (P1) and the second path (P2)(CD) method of the content presenting on, this client device (CD) comprises at least the first communication interfaceWith second communication interface (CI1, CI2), wherein, described at least the first communication interface and second communication interface(CI1, CI2) has mailing address, and described content is via at least first server with mailing addressCommunication interface and second server communication interface (SI1, SI2) are to visit for client device (CD)Ask, the first path (P1) is by mailing address and the first server of described the first communication interface (CI1)The address designation of communication interface (SI1), the second path (P2) is by described second communication interface (CI2)Mailing address and the address designation of second server communication interface (SI2), described content have andThe bit rate (BRA, BRB) of holding retrains under at least two versions of corresponding coding quality available, institutePresent the duration pair each being divided in time with described content identical of stating at least two versionsThe piece of answering, by one of bit rate (BRA, BRB) of supporting and time index i home block, described visitorFamily end equipment (CD) by described the first path and the second path (P1, P2) simultaneously addressable described inHold, it is characterized in that, the method is included in the following steps on client device (CD):
    -(S1) measure the first Available Bit Rate (BR1) and the second path on the first path (P1)(P2) the second Available Bit Rate (BR2) on;
    -(S2) according to measured the first Available Bit Rate (BR1) and according to measured secondAvailable Bit Rate (BR2) is determined the bit rate of asking in the bit rate (BRA, BRB) of supporting(RBR)；
    -(S3) send for receiving by time index i and determined asking via the first path (P1)The first request of the Part I of the piece of bit rate (RBR) mark of asking and via the second path (P2)Send for receive identified piece Part II second request, the described Part I of described andDescribed Part II is complementary, and described Part I and the described Part II of described have according to surveyThe size that first Available Bit Rate (BR1) of amount and the second Available Bit Rate (BR2) of measuring are calculated;
    -(S4) receive the Part I of asking via the first path (P1) and via the second path(P2) receive the Part II of asking.
  2. 2. the Part I the method for claim 1, wherein asked has the first size(NB1), the Part II of asking comprises having the second size (NB2), wherein, described firstThe ratio of little (NB1) and described the second size (NB2) equals measured the first Available Bit Rate (BR1)Ratio with measured the second Available Bit Rate (BR2).
  3. 3. the method for claim 1, wherein determine the step of the bit rate (RBR) of askingSuddenly (S2) comprises measured the first Available Bit Rate (BR1) of assessment and the second measured available ratioThe step of the summation (SUM) of special rate (BR2), and determine and to ask from this summation (SUM)Bit rate (RBR).
  4. 4. method as claimed in claim 3, wherein, determines the step of the bit rate (RBR) of askingSuddenly (S2) is, selects lower than or equal measured in the bit rate (BRA, BRB) of supportingThe first Available Bit Rate (BR1) and the summation (SUM) of measured the second Available Bit Rate (BR2)Deduct the Maximum Bit Rate of setting.
  5. 5. the method for claim 1, wherein determine the step of the bit rate (RBR) of askingSuddenly (S2) is, in the bit rate (BRA, BRB) of supporting selection lower than or equal the second thresholdValue (BRTH2) deducts the Maximum Bit Rate of setting.
  6. 6. method as claimed in claim 3, wherein, the Part I of asking has the first size(NB1), described the first size (NB1) with by time index i and determine the bit rate of asking(RBR) block size of mark and measured the first Available Bit Rate (BR1) and this summation (SUM)Between ratio proportional.
  7. 7. the method for claim 1, wherein each client device (CD) receives completelyPiece, carries out four steps (S1, S2, S3, S4).
  8. 8. the method for claim 1, wherein the method also relates in step (S1) and holding beforeCapable goes up for determining at path (P1, P2) the first Available Bit Rate and the second Available Bit Rate measuredWhether (BR1, BR2) is greater than another step (SA) of first threshold (BRTH1), wherein, forClient device (CD) determines that measured Available Bit Rate (BR1, BR2) is greater than first thereonFour steps (S1, S2, S3, S4) are exclusively carried out in the path (P1, P2) of threshold value (BRTH1).
  9. 9. the method for claim 1, wherein measure the first Available Bit Rate and the second available ratioThe step (S1) of special rate comprises: computing client end equipment (CD) by described the first path (P1) andThe request that the second path (P2) sends and in response to described request by described the first path and described theThe two-way time of the confirmation message that two paths (P2) send.
  10. 10. method as claimed in claim 9, wherein, the method comprises by client device (CD)Via the list that one of at least receives the bit rate (BRA, BRB) of supporting of path (P1, P2)Another step, and receive big or small another of piece for the bit rate (BRA, BRB) of each supportStep.
  11. 11. methods as described in any one in claim 1 to 7, described client device (CD) alsoComprise the third communication interface (CI3) with mailing address, client device (CD) is via having communicationThe addressable described content of the 3rd server communications (SI3) of address, described third communication interface (CI3)Mailing address and the address designation Third Road footpath (P3) of the 3rd server communications (SI3), fromRespectively can in first, second, and third of first, second, and third path (P1, P2, P3) upper measurementDetermine the bit rate (RBR) of asking, client device (CD) with bit rate (BR1, BR2, BR3)Ask the piece with bit rate (RBR) mark of asking by time index i via the first path (P1)Part I, ask the Part II of described via the second path (P2), via Third Road footpath (P3)Ask the Part III of described, described client device (CD) is by described first, second, and thirdPath (P1, P2, P3) is addressable described content simultaneously, and wherein, the method relates at client device(CD) another step on:
    -in the time that described client device (CD) receives the first and second asked part completely, visitorFamily end equipment (CD) receives the first segmentation of Part III, the second segmentation of Part III and described firstSegmentation complementation, and work as client device (CD) and determined the Available Bit Rate (BR3) on path (P3)While being less than the 3rd threshold value (BRTH3), (S5) sending and be used for receiving the second segmentation via path (P1)The request of the first complementary portion, and send for receiving described the second segmentation via path (P2)The request of the second complementary portion, described the first complementary portion and the second complementary portion do not have overlapping and described inThe two the set of the first complementary portion and described the second complementary portion produces whole the second segmentation.
  12. 12. 1 kinds for receiving the client device (CD) of the content that will present, described client device(CD) comprise at least the first and second communication interfaces (CI1, CI2), wherein, described at least the first andSecond communication interface (CI1, CI2) has mailing address, and client device (CD) is via having communicationThe addressable described content of at least the first and second server communications (SI1, SI2) of address, firstPath (P1) is by mailing address and the first server communication interface (SI1) of described the first communication interface (CI1)Address designation, the second path (P2) is by the mailing address and second of described second communication interface (CI2)The address designation of server communications (SI2), described content have with support bit rate (BRA,BRB) retrain under at least two versions of corresponding coding quality available, described at least two versions everyIndividually be divided in time the piece corresponding with the identical duration of described content, by time index i andBit rate (BRA, the BRB) home block of holding, described client device (CD) is by first and secondPath (P1, P2) is addressable described content simultaneously, it is characterized in that described client device (CD)Comprise:
    -for measuring the first Available Bit Rate (BR1) and the second path on the first path (P1)(P2) parts of the second Available Bit Rate (BR2) on;
    -for the first Available Bit Rate (BR1) according to measured and the second measured available bitsRate (BR2) is determined the bit rate (RBR) of asking in the bit rate (BRA, BRB) of supportingParts;
    -for sending via the first path (P1) for receiving by time index i and determined requestFirst of the Part I of the piece of bit rate (RBR) mark is asked and is sent out via the second path (P2)Send for receive described Part II second request parts, the Part I of described and secondPart is complementary, and the Part I of described and Part II have according to the first available bits of measuringThe size that rate (BR1) and measured the second Available Bit Rate (BR2) are calculated;
    -for receiving the Part I of asking via the first path (P1) and via the second path (P2)Receive the parts of the Part II of asking.
  13. 13. client devices as claimed in claim 12, wherein, also comprise for via first andAt least one of two paths (P1, P2) receives the letter relevant with the bit rate (BRA, BRB) of supportingBreath and receive the information relevant with the size of piece for the bit rate (BRA, BRB) of each supportParts.
  14. 14. client devices as claimed in claim 13, wherein, for determining the bit rate of asking(RBR) parts adapt to measured the first Available Bit Rate (BR1) of assessment and measured theThe summation (SUM) of two bit rates (BR2), and described parts adapt to support bit rate (BRA,BRB) in, select lower than or equal measured the first Available Bit Rate (BR1) and measured theThe summation (SUM) of two Available Bit Rates (BR2) deducts the Maximum Bit Rate of setting.
  15. 15. client devices as described in claim 12 to 14 any one, wherein, also comprise forDetermine whether measured Available Bit Rate (BR1, BR2) exceedes the portion of first threshold (BRTH1)Part.
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